Rodann Electronics TXRX1000A Indoor Wireless Transmitter and Receiver up to 500 ft.<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Welcomes with a pleasant-sounding chime and helps prevent theft </span></li><li><span class="a-list-item"> 500ft range wireless transmitter powered by 3 AA batteries </span></li><li><span class="a-list-item"> Maintenance-free， installs in minutes </span></li><li><span class="a-list-item"> 1-Year Warranty </span></li><li><span class="a-list-item"> Made in the U.S.A. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/410YHOU46VL.jpg" noproxy>